Page 3 - Important Information; Warranty; Patents; WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS
Important Information Warranty The SCXI-1125 is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to be defectiv...
Page 4 - Conventions; File»Page Setup»Options; bold
Conventions The following conventions are used in this manual: < > Angle brackets that contain numbers separated by an ellipsis represent a range of values associated with a bit or signal name—for example, P0.<3..0>. » The » symbol leads you through nested menu items and dialog box optio...
Page 5 - Contents
© National Instruments Corporation v SCXI-1125 User Manual Contents Chapter 1About the SCXI-1125 What You Need to Get Started ...................................................................................... 1-1National Instruments Documentation ....................................................
Page 8 - or Later
Contents SCXI-1125 User Manual viii ni.com Appendix ASpecifications Appendix BUsing SCXI Channel Strings with Traditional NI-DAQ (Legacy) 7.0 or Later Appendix CRemoving the SCXI-1125 Appendix DCommon Questions Glossary Index Figures Figure 2-1. Connecting a Ground-Referenced Signal ...................
Page 9 - Tables
Contents © National Instruments Corporation ix SCXI-1125 User Manual Tables Table 2-1. Front Signal Pin Assignments .............................................................. 2-6 Table 2-2. Rear Signal Pin Assignments ................................................................ 2-8 Table 5-1...
Page 10 - What You Need to Get Started
© National Instruments Corporation 1-1 SCXI-1125 User Manual 1 About the SCXI-1125 This chapter introduces the SCXI-1125 module and explains how to install the software and hardware. The SCXI-1125 is an eight-channel isolated analog input conditioning module with programmable gain and filter setting...
Page 11 - National Instruments Documentation
Chapter 1 About the SCXI-1125 SCXI-1125 User Manual 1-2 ni.com Note For maximum allowable voltage for a particular terminal block refer to Table A-2, Terminal Block Maximum Voltages . – SCXI or PXI/SCXI combination chassis – One of the following: • E/M Series DAQ device • SCXI-1600 module – A comput...
Page 12 - Drivers and Updates
Chapter 1 About the SCXI-1125 © National Instruments Corporation 1-3 SCXI-1125 User Manual • The SCXI Quick Start Guide —This document contains a quick overview for setting up an SCXI chassis, installing SCXI modules and terminal blocks, and attaching sensors. It also describes setting up the SCXI s...
Page 13 - Installing the SCXI-1125 Module into the SCXI Chassis
Chapter 1 About the SCXI-1125 SCXI-1125 User Manual 1-4 ni.com Installing Application Software, NI-DAQ, and the DAQ Device Refer to the DAQ Getting Started Guide packaged with the NI-DAQ software to install your application software, NI-DAQ driver software, and the DAQ device to which you will conne...
Page 14 - Verifying the SCXI-1125 Installation in Software; Installing SCXI Using NI-DAQmx in Software
Chapter 1 About the SCXI-1125 © National Instruments Corporation 1-5 SCXI-1125 User Manual Connecting the SCXI-1125 to a n E/M Series DAQ Device for Parallel Scanning This configuration allows you to route all eight channels of the SCXI-1125 in parallel to eight input channels of the E/M Series DAQ ...
Page 15 - Manually Adding Modules in NI-DAQmx; Installing SCXI Using Traditional NI-DAQ (Legacy) in Software; Verifying and Self-Testing the Installation
Chapter 1 About the SCXI-1125 SCXI-1125 User Manual 1-6 ni.com Manually Adding Modules in NI-DAQmx If you did not auto-detect the SCXI modules, you must manually add each of the modules. Refer to the SCXI Quick Start Guide to manually add modules. Note NI recommends auto-detecting modules for the fi...
Page 16 - Troubleshooting the Self-Test Verification; Troubleshooting in NI-DAQmx
Chapter 1 About the SCXI-1125 © National Instruments Corporation 1-7 SCXI-1125 User Manual Troubleshooting the Self-Test Verification If the Self-Test Verification did not verify the chassis configuration, complete the steps in this section to troubleshoot the SCXI configuration. Troubleshooting in ...
Page 17 - OK
Chapter 1 About the SCXI-1125 SCXI-1125 User Manual 1-8 ni.com module following the steps listed in the SCXI Quick Start Guide . Click OK . b. If another module appears where the cabled module should be, click the drop-down listbox next to the correct slot and select the cabled module. A message box...
Page 18 - Connecting Signals; AC and DC Voltage Connections
© National Instruments Corporation 2-1 SCXI-1125 User Manual 2 Connecting Signals This chapter describes the input and output signals connections to the SCXI-1125 module with the module front connector and the rear signal connector. This chapter also includes specifications and connection instructio...
Page 19 - Ground-Referenced Signal
Chapter 2 Connecting Signals SCXI-1125 User Manual 2-2 ni.com completely isolated from other channels. You can operate with common-mode voltage levels up to 300 V rms . Figures 2-1 through 2-4 show signal connection methods that give the highest noise immunity. Ground-Referenced Signal When the nega...
Page 20 - Floating Signal
Chapter 2 Connecting Signals © National Instruments Corporation 2-3 SCXI-1125 User Manual Floating Signal In cases where both signal lines at the transducer end are floating and no common-mode voltage exists, establish an earth connection at the SCXI-1125 by connecting the negative input line to cha...
Page 22 - Pin Assignments
Chapter 2 Connecting Signals © National Instruments Corporation 2-5 SCXI-1125 User Manual The value of the bias resistor should be between 100 k Ω and 1 M Ω . An added DC offset voltage results, due to input bias current flowing through the bias resistor. For example, with a 1 M Ω bias resistor and ...
Page 24 - Temperature Sensor Connection; Rear Signal Connector
Chapter 2 Connecting Signals © National Instruments Corporation 2-7 SCXI-1125 User Manual Temperature Sensor Connection Pin C4 on the front signal connector is used to connect to a terminal block temperature sensor. The temperature sensor channel is not isolated and is referenced to the chassis grou...
Page 26 - Configuring and Testing; Common Software-Configurable Settings; Filter Bandwidth
© National Instruments Corporation 3-1 SCXI-1125 User Manual 3 Configuring and Testing This chapter discusses configuring the SCXI-1125 in MAX for use with either NI-DAQmx or Traditional NI-DAQ (Legacy), creating and testing a virtual channel, global channel or task. For more information on the rela...
Page 27 - Configurable Settings in MAX
Chapter 3 Configuring and Testing SCXI-1125 User Manual 3-2 ni.com Connecting the SCXI-1125 in an SCXI Chassis to an E/M Series DAQ Device for Multiplexed Scanning Refer to the SCXI Quick Start Guide to install the cable adapter and connect the SCXI modules to the DAQ device. If you have already ins...
Page 28 - Creating a Voltage Global Channel or Task
Chapter 3 Configuring and Testing © National Instruments Corporation 3-3 SCXI-1125 User Manual NI-DAQmx In NI-DAQmx, you can configure software settings such as filter bandwidth and gain/input signal range in the following ways: • Task or global channel in MAX • Functions in your application Note Al...
Page 31 - Creating a Virtual Channel; Verifying the Signal; Verifying the Signal in NI-DAQmx Using a Task or Global Channel
Chapter 3 Configuring and Testing SCXI-1125 User Manual 3-6 ni.com Creating a Virtual Channel To create a virtual channel, complete the following steps: 1. Right-click Data Neighborhood and select Create New . 2. Select Traditional NI-DAQ Virtual Channel and click Finish . 3. Click Add Channel . 4. ...
Page 32 - Device; Verifying the Signal Using Channel Strings
Chapter 3 Configuring and Testing © National Instruments Corporation 3-7 SCXI-1125 User Manual 8. Click the Device tab. 9. Enter the appropriate information on the Device tab. 10. Click the Test button. 11. Click the Start button. 12. After you have completed verifying the channels, click the Stop b...
Page 33 - Verifying the Signal Using Virtual Channel
Chapter 3 Configuring and Testing SCXI-1125 User Manual 3-8 ni.com Complete the following steps to use channel strings in verifying the signal: 1. Expand Devices and Interfaces . 2. Expand Traditional NI-DAQ Devices . 3. Right-click the appropriate E Series DAQ device. 4. Click Test Panels . 5. Ente...
Page 34 - Gain
© National Instruments Corporation 4-1 SCXI-1125 User Manual 4 Theory of Operation The section includes a brief overview and a detailed discussion of the circuit features of the module. The two major modes of operation, multiplexed and parallel mode, are discussed. Refer to Figure 4-1 while reading ...
Page 35 - Filter Bandwidth and Cutoff Frequency
Chapter 4 Theory of Operation SCXI-1125 User Manual 4-2 ni.com Refer to the Configurable Settings in MAX section of Chapter 3, Configuring and Testing , for more information about programmatically setting gain using range settings in MAX. For more information about programmatically setting gain usin...
Page 36 - Multiplexed Hardware Operation Theory; Operating in Parallel Mode
Chapter 4 Theory of Operation © National Instruments Corporation 4-3 SCXI-1125 User Manual Multiplexed Hardware Operation Theory When you configure a module for multiplexed mode operation, the routing of multiplexed signals to the E/M Series DAQ device depends on which module in the SCXI system is c...
Page 37 - Theory of Parallel Hardware Operation
Chapter 4 Theory of Operation SCXI-1125 User Manual 4-4 ni.com Theory of Parallel Hardware Operation In parallel mode, the CH0 signal on the rear signal connector is configured as the output of the SCXI-1125 analog input channel 0. The rear signal connector carries each of the analog outputs of the ...
Page 38 - Temperature Measurements Using Thermocouples
© National Instruments Corporation 5-1 SCXI-1125 User Manual 5 Using the SCXI-1125 This chapter discusses typical applications for the SCXI-1125. While this list is not comprehensive, it provides some guidance on how to improve measurement accuracy for some of the most popular applications of the SC...
Page 41 - Making High-Voltage Measurements
Chapter 5 Using the SCXI-1125 SCXI-1125 User Manual 5-4 ni.com Making High-Voltage Measurements Another common use of the SCXI-1125 is to make measurements up to 1000 VDC. Making measurements beyond ± 5 V requires use of the an attenuator terminal block. The SCXI-1327 and SCXI-1313A terminal blocks ...
Page 42 - Developing Your Application in NI-DAQmx; Typical Program Flowchart
Chapter 5 Using the SCXI-1125 © National Instruments Corporation 5-5 SCXI-1125 User Manual The overall input impedance is reduced when attenuating the input, but this is acceptable in most applications. Refer to terminal block installation guides for more information. Appendix A, Specifications , sh...
Page 44 - General Discussion of Typical Flowchart
Chapter 5 Using the SCXI-1125 © National Instruments Corporation 5-7 SCXI-1125 User Manual General Discussion of Typical Flowchart The following sections discuss briefly considerations for a few of the steps in Figure 5-1. These sections give an overview of some of the options and features available...
Page 45 - Configuring Channel Properties; Property
Chapter 5 Using the SCXI-1125 SCXI-1125 User Manual 5-8 ni.com time. For continuous acquisition, you must use a while loop around the acquisition components even if you configured the task for continuous acquisition using MAX or the DAQ Assistant. For continuous and buffered acquisitions, you can se...
Page 46 - Completing the Application; Developing an Application Using LabVIEW; Functions»
Chapter 5 Using the SCXI-1125 © National Instruments Corporation 5-9 SCXI-1125 User Manual Acquiring, Analyzing, and Presenting After configuring the task and channels, you can start the acquisition, read measurements, analyze the data returned, and display it according to the needs of your applicat...
Page 48 - Using a DAQmx Channel Property Node in LabVIEW
Chapter 5 Using the SCXI-1125 © National Instruments Corporation 5-11 SCXI-1125 User Manual Using a DAQmx Channel Property Node in LabVIEW You can use property nodes in LabVIEW to manually configure the channels. To create a LabVIEW property node, complete the following steps: 1. Launch LabVIEW. 2. ...
Page 49 - Specifying Channel Strings in NI-DAQmx
Chapter 5 Using the SCXI-1125 SCXI-1125 User Manual 5-12 ni.com 7. Change the property to read or write to either get the property or write a new value. Right-click the property, go to Change To , and select Write , Read , or Default Value . 8. After you have added the property to the property node,...
Page 51 - Text Based ADEs; DAQ Assistant; Programmable NI-DAQmx Properties
Chapter 5 Using the SCXI-1125 SCXI-1125 User Manual 5-14 ni.com Text Based ADEs You can use text based ADEs such as LabWindows/CVI, Measurement Studio, Visual Basic, .NET, and C# to create code for using the SCXI-1125. LabWindows/CVI LabWindows/CVI works with the DAQ Assistant in MAX to generate cod...
Page 54 - Typical Program Flow
Chapter 5 Using the SCXI-1125 © National Instruments Corporation 5-17 SCXI-1125 User Manual Typical Program Flow After you have determined how you want to address the channels and whether you want to configure the SCXI-1125 in MAX or LabVIEW, you can design your application using a typical program f...
Page 56 - Data Acquisition»Analog Input
Chapter 5 Using the SCXI-1125 © National Instruments Corporation 5-19 SCXI-1125 User Manual An example of using the AI Parameter VI to control an SCXI-1125 is shown in Figure 5-4. Figure 5-4. Using the AI Parameter VI to Set Up the SCXI-1125 Configure, Start Acquisition, and Take Readings Using Trad...
Page 57 - Analyze and Display Using Traditional NI-DAQ (Legacy) in LabVIEW
Chapter 5 Using the SCXI-1125 SCXI-1125 User Manual 5-20 ni.com Convert Scaling Using Traditional NI-DAQ (Legacy) in LabVIEW If you need scaling, you can either use an analog input voltage virtual channel with a custom scale configured in MAX or SCXI channel strings, and provide scaling in your LabV...
Page 58 - Start»Programs»National Instruments»
Chapter 5 Using the SCXI-1125 © National Instruments Corporation 5-21 SCXI-1125 User Manual Traditional NI-DAQ (Legacy) in Text-Based ADEs NI text-based ADEs, such as LabWindows/CVI, Measurement Studio for Microsoft Visual Basic, and Measurement Studio for Microsoft Visual C++, offer help in the dev...
Page 59 - Configure Module Settings Using Traditional NI-DAQ (Legacy) C API; Start»Programs»National Instruments»NI-DAQ; Function
Chapter 5 Using the SCXI-1125 SCXI-1125 User Manual 5-22 ni.com Note NI strongly recommends monitoring the built-in error status of each NI-DAQ function. The NI-DAQ C API provides the NIDAQErrorHandler function, which ensures that a specified NI-DAQ function executed properly, and assists in handlin...
Page 61 - Start»Programs»National; Using Software for Multiplexed Scanning
Chapter 5 Using the SCXI-1125 SCXI-1125 User Manual 5-24 ni.com the data corresponds to a scanned channel for easier access by C applications. BASIC applications need not call SCAN_Demux to rearrange two-dimensional arrays since these arrays are accessed in column-major order. For more information r...
Page 62 - LabVIEW and the SCXI Channel String
Chapter 5 Using the SCXI-1125 © National Instruments Corporation 5-25 SCXI-1125 User Manual support virtual channels using Data Neighborhood (DAQ Channel Wizard) in MAX. In LabWindows/CVI, C, or C++ development environments, several NI-DAQ function calls need to be made to set up each module involve...
Page 63 - LabVIEW and the Virtual Channel String
Chapter 5 Using the SCXI-1125 SCXI-1125 User Manual 5-26 ni.com The last parameter, channels , is the list of channels that are scanned for module z . It can have several formats: • ob x ! sc y ! md z ! n , where n is a single input channel. • ob x ! sc y ! md z ! n1:n2 , where n1 and n2 represent a...
Page 64 - Data Neighborhood; Performing a Multiplexed Scan; input limits
Chapter 5 Using the SCXI-1125 © National Instruments Corporation 5-27 SCXI-1125 User Manual Note You cannot mix virtual channels with the SCXI channel strings shown in the previous section. To create a virtual channel for the SCXI-1125, insert a new analog input channel in the Data Neighborhood path...
Page 65 - C and Low-Level DAQ Functions; Using Software for Parallel Scanning; operating mode
Chapter 5 Using the SCXI-1125 SCXI-1125 User Manual 5-28 ni.com C and Low-Level DAQ Functions When using a C-based environment, several steps are needed to configure the SCXI-1125 for multiplexed scanning. The following procedure outlines the steps for programming with the low-level DAQ function cal...
Page 66 - C and Parallel Mode; Other Application Documentation and Material
Chapter 5 Using the SCXI-1125 © National Instruments Corporation 5-29 SCXI-1125 User Manual After parallel mode has been configured in software, you can scan the SCXI-1125 channels by entering the corresponding E Series DAQ device channels or a sequential SCXI channel string in the channel parameter...
Page 67 - Calibration; Calibration Procedures
Chapter 5 Using the SCXI-1125 SCXI-1125 User Manual 5-30 ni.com Calibration The SCXI-1125 is shipped with a calibration certificate and is calibrated by the factory to the specifications described in Appendix A, Specifications . Calibration constants are stored inside the calibration EEPROM and prov...
Page 68 - One-Point Offset Calibration; internal calibration
Chapter 5 Using the SCXI-1125 © National Instruments Corporation 5-31 SCXI-1125 User Manual One-Point Offset Calibration To perform offset calibration on your module, follow this procedure if you are using LabVIEW: 1. Make sure the DAQ device or DMM you are using has a valid calibration and meets th...
Page 69 - Two-Point Gain and Offset Calibration
Chapter 5 Using the SCXI-1125 SCXI-1125 User Manual 5-32 ni.com If you are using a C-based ADE, use the following procedure to do an offset calibration on the SCXI-1125: 1. Make sure the DAQ device or DMM you are using has a valid calibration and meets the accuracy specifications for your applicatio...
Page 70 - Input Characteristics; Overall Gain
© National Instruments Corporation A-1 SCXI-1125 User Manual A Specifications This appendix lists the specifications for the SCXI-1125 modules. These specifications are typical at 25 °C unless otherwise noted. Input Characteristics Note Refer to Tables 5-1 and 5-2 for extended range using the SCXI-1...
Page 72 - Absolute Accuracy
Appendix A Specifications © National Instruments Corporation A-3 SCXI-1125 User Manual Absolute Accuracy Nominal Range Overal l Ga in % of Re a d in g Of fs et System Noi se (peak, 3 sigma) T emperatur e Drift Absolute Ac curacy at Ful l Sca le (mV ) 1 Single P o int A v erage Ty p ic a l Max 4 Hz 1...
Page 74 - Analog Inputs
Appendix A Specifications © National Instruments Corporation A-5 SCXI-1125 User Manual Analog Inputs Number of input channels ...................... 8 differential Input range ............................................. ± 2.5 mVDC to ±5 VDC Input coupling ........................................ D...
Page 75 - Power Consumption; Transfer Characteristics; Stability
Appendix A Specifications SCXI-1125 User Manual A-6 ni.com Normal Mode Rejection, 50/60 Hz (NMRR) 4 Hz filter enabled ...........................60 dB Crosstalk at 1kHz Adjacent channels............................–75 dB All other channels ............................– 90 dB Input coupling Default ....
Page 76 - Physical
Appendix A Specifications © National Instruments Corporation A-7 SCXI-1125 User Manual Physical Figure A-1. SCXI-1125 Dimensions Weight .................................................... 641 g (22.6 oz) 3.0 cm (1.2 in.) 17.2 cm (6.8 in.) 18.8 cm (7.4 in.)
Page 77 - Maximum Working Voltage; Environmental
Appendix A Specifications SCXI-1125 User Manual A-8 ni.com Maximum Working Voltage Maximum voltage rating refers to the signal voltage plus the common mode voltage (Signal + common mode). Voltage of each input shall remain within 300 V of ground. Channel-to-earth .......................................
Page 78 - Safety; CE Compliance
Appendix A Specifications © National Instruments Corporation A-9 SCXI-1125 User Manual Safety This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use: • IEC 61010-1, EN-61010-1 • UL 61010-1, CSA 6101...
Page 79 - Environmental Management; Waste Electrical and Electronic Equipment (WEEE); ⬉ᄤֵᙃѻક∵ᵻࠊᄣ⧚ࡲ⊩ ˄Ё; RoHS
Appendix A Specifications SCXI-1125 User Manual A-10 ni.com Environmental Management National Instruments is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial not onl...
Page 82 - Removing the SCXI-1125 from MAX; Devices and Interfaces; Removing the SCXI-1125 from a Chassis
© National Instruments Corporation C-1 SCXI-1125 User Manual C Removing the SCXI-1125 This appendix explains how to remove the SCXI-1125 from MAX and an SCXI chassis. Note Figure C-1 shows an SCXI chassis, but the same steps are applicable to a PXI/SCXI combination chassis. Removing the SCXI-1125 fr...
Page 84 - Common Questions; Feature
© National Instruments Corporation D-1 SCXI-1125 User Manual D Common Questions This appendix lists common questions related to the use of the SCXI-1125. The SCXI-1125 is backward compatible with the SCXI-1120, but what are the major differences between the SCXI-1120 and the SCXI-1125? Table D-1 com...
Page 85 - I have gone over the; in
Appendix D Common Questions SCXI-1125 User Manual D-2 ni.com Which version of NI-DAQ is needed to work with the SCXI-1125 and how do I get the most current version of NI-DAQ? You must have NI-DAQ 7.0 or later. Visit ni.com and follow the link, Download Software»Drivers and Updates»Search Drivers and...
Page 87 - In LabVIEW, can I use a VI to change my filter setting?
Appendix D Common Questions SCXI-1125 User Manual D-4 ni.com In LabVIEW, can I use a VI to change my filter setting? In NI-DAQmx, you can change the filter settings using a DAQmx Channel property node. In Traditional NI-DAQ (Legacy), there is no VI available to do this. You must use the configuratio...
Page 88 - Glossary; Symbol
© National Instruments Corporation G-1 SCXI-1125 User Manual Glossary Symbol Prefix Value p pico 10 – 12 n nano 10 – 9 μ micro 10 – 6 m milli 10 – 3 k kilo 10 3 M mega 10 6 G giga 10 9 T tera 10 12 Numbers/Symbol ° Degrees. ≥ Greater than or equal to. ≤ Less than or equal to. Ω Ohms. / Per. % Percen...
Page 98 - Index
© National Instruments Corporation I-1 SCXI-1125 User Manual Index A AC and DC voltage connections, 2-1 AC-coupling, 2-4floating AC-coupled signal connection (figure), 2-4 floating signal, 2-3floating signal connection (figure), 2-3front signal connector figure, 2-6table, 2-6 ground-referenced AC-co...
